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grid of the ground surface. In addition, aquifer configuration pick data were processed to be <br />HydroBase-compatible and will be submitted to the SPDSS project manager for inclusion in <br />HydroBase. The data from this task were used to help identify additional data needs in the <br />South Platte Alluvium Region and supported the design of the groundwater field programs in <br />Phases 1, 2 and 3. <br />Below are conclusions from completion of these tasks. <br />General Conclusions <br />^ The aquifer configuration data collected, analyzed, and presented in this TM represents <br />a significant addition to the knowledge and characterization of the alluvial groundwater <br />systems within the South Platte Alluvium Region. This task of the SPDSS has compiled a <br />database of 1,770 alluvial aquifer bottom picks. In addition continuous grids of the <br />aquifer bottom, water level surface, saturated thickness, and ground surface have been <br />created and presented. <br />^ Much of the data presented in this TM were available in previously published reports. <br />However, many of the reports are out of print and limited to hard-copy maps. Through <br />the work of this task, the historical data have been digitized, enhanced with new data, <br />merged together, and converted to electronic formats that can be easily used for <br />analysis. <br />^ The integration of aquifer configuration data from a variety of sources has resulted in <br />comprehensive databases and maps that represent the best available characterization of <br />the alluvial aquifer configuration within the South Platte Alluvium Region study area. <br />^ The alluvial aquifer configuration presented in this TM is sufficient for the purpose of <br />commencing regional scale water resources planning and can be used directly as model <br />input for the alluvial aquifer groundwater modeling under Task 48. <br />Specific Conclusions <br />^ The Phase 1, 2, and 3 Tasks 31 and 42 activities satisfy the objectives of collecting <br />available published aquifer configuration data, enhancing HydroBase with these data, <br />guiding the Phase 1 and Phase 2 field investigations, and helping characterize the <br />configuration of the alluvial aquifer in the South Platte Alluvium Region. <br />A comparison of bottom of alluvium picks from the SPDSS drilling with the contouring <br />from historical reports indicates the paleochannel in the mainstem of the South Platte <br />River Alluvium near Julesburg, as represented by the historical contours, may need to be <br />shifted. Modifications to the contours were not made at this time because sufficient data <br />are not available to guide and validate contour modifications. However, the current <br />characterization is sufficient for regional scale modeling. If more localized study or <br />modeling is conducted in this area, additional bottom of alluvium elevation point data <br />should be gathered to further evaluate the accuracy of the historical contours. <br />^ The initial bottom of alluvium grid and groundwater level grid created for this TM both <br />exceeded ground surface in isolated areas. These areas represented approximately one <br />SPDSS Phase 3 Task 42.3 TM -Final 15 <br />11/30/2006 <br />